KR101874450B1 - Remote connection device for load break switch - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ground voltage transformer having a built-in load switch, and more particularly, to a load opening / closing remote control system of a load-opening type ground transformer that enables monitoring and remote control of the load switch.
The present invention as described above is mounted on the ground transformer 500 and allows the movable contact 30 to contact at least one of the plurality of stationary contactors 40 by the rotation of the rotary shaft 20 to open and close the load, A load switch (100) using insulating oil; A motor unit 200 for providing a rotational force to the rotary shaft 20; A control unit 300 for controlling the motor unit 200; And the control unit 300 to transmit the rotation number and rotation angle information of the motor unit 200 to the central control center 600 or to receive the control signal of the motor unit 200 from the central control center 600 And a communication unit 400.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a remote control system for load-

BACKGROUND OF THE INVENTION 1. Field of the Invention [0002] The present invention relates to a ground voltage transformer having a built-in load switch, and more particularly, to a load opening / closing remote control system of a load-opening type ground transformer that enables monitoring and remote control of the load switch.

Conventionally, in order to supply electric power at a power of 22.9 kV or more with a power of 100 kW or more in a power distribution system, it is possible to supply electric power by installing a ground switch.

However, in case of low load (220 / 380V) power supply, a separate ground switch is installed for each of 4 ~ 6 ground transformers in the case of load-intensive areas, such as underground transmission lines or underground power supply in industrial and housing complex development areas, When power is supplied from the branch line to low voltage, it is necessary to install a separate ground switch for each ground transformer installed. Therefore, the cost is increased, the power factor is increased due to the complexity of the power facility, and the power factor is not suitable for stabilizing the power supply.

The ground switch is used for opening and closing the special high voltage power supply and switching the load at the time of replacement or inspection. If a fault occurs in the switchgear, the switchgear, the ground transformer, or the power cable for the ground transformer supply, the ground switch must be switched to a load to receive power from the other ground transformer to check the faulty ground transformer After the replacement, power or load switch is turned on to transmit.

The ground transformer used in the underground distribution line power supply system is as follows. First, the installation cost for supplying a small capacity power of less than 100 kW is not more than the installation cost for supplying a large capacity power of 100 kW or more. Second, In order to minimize the interruption and power failure in case of failure of the power cable for supplying the transformer or ground transformer, it is necessary to improve the reliability of the power supply by proper operation of the power system. Third, to check whether the ground transformer or power cable is abnormal during power supply It is necessary to improve the efficiency of facility maintenance for easy operation.

Conventional ground transformers require a ground transformer and a separate ground switch to supply small-capacity, low-voltage (220 / 380V) power of less than 100 kW.

On the other hand, in order to supply a large-capacity extra-high voltage (22.9 kV) power of 100 kW or more, it is necessary to provide only the ground switch to supply power to the receiver through the power supply system from the substation. It is more economical than supply.

As a result, a transformer with a built-in load break switch called a ground-breaking transformer is currently applied to the main load line in KEPCO. In the high-voltage side of the load-opening type ground-type transformer, a load switch which can select a power source is provided, and it is driven only by manual operation.

Korean Registered Patent No. 10-1060872 (Published on August 31, 2011) Korean Patent Registration No. 10-0448001 (Date of Publication: September 08, 2004)

An object of the present invention is to provide a load opening / closing remote control system for a load-unloading type ground-type transformer to remotely control the load opening / closing operation and to monitor the condition of the load-

Other objects and advantages of the present invention will be described hereinafter and will be understood by the embodiments of the present invention. Further, the objects and advantages of the present invention can be realized by the means and the combination shown in the claims.

The above object of the present invention can be achieved by a load transformer mounted on a ground transformer and capable of opening and closing a load by contacting a movable contactor with at least one of a plurality of stationary contactors by rotation of a rotary shaft and using insulating oil as a sole medium; A motor unit for providing rotational force to the rotating shaft; A control unit for controlling the motor unit; And a communication unit connected to the control unit to transmit the rotation number and the rotation angle information of the motor unit to the central control center or to receive a control signal of the motor unit from the central control center by the load opening and closing remote control system of the load- .

Here, the motor unit may be constituted by a motor directly connected to the rotary shaft, a gear interlocked with the rotary shaft, and a motor for transmitting the rotary force to the gear. When the motor is composed of a gear and a motor, a tip of the rotation shaft may be mounted with a handle for manual rotation.

In addition, the load switch may be equipped with an insulating oil level sensor connected to the control unit. At this time, the measured value of the insulating oil level sensor is transmitted to the central control center through the communication unit, and when the measured value is a threshold value, the central control center can broadcast an alarm.

In addition, the central control center can monitor the contact position of the movable contactor of the load switch through the motor unit and the control unit.

The central control center predicts the degree of wear of the movable contactor and the fixed contactor based on the contact position state information of the movable contactor and the information on the number of revolutions of the rotary shaft, It is possible to control the rotation direction of the rotary shaft.

The remote control system for a load opening / closing type ground-based transformer according to the present invention includes a load switch installed in a ground transformer, a motor connected to the load switch, a control unit, a communication unit, and a central control center for centrally managing the load switch, Monitoring and remote control are possible, which can shorten the time required to recover a faulty ground transformer.

In addition, it is possible to monitor the state of the insulating oil remotely, thereby reducing the waste of manpower due to checking of the insulating oil, and preventing an accident caused by insufficient oil.

In addition, the present invention can be configured to selectively use remote or manual operation in constructing the motor unit, and it is possible to manually operate the load switch when remote control is impossible due to a failure of the communication unit or the like.

According to the present invention, the contact position state of the movable contactor of the load contactor can be monitored through the motor unit and the control unit, and the degree of wear of the movable contactor and the fixed contactor Can be predicted.

Further, by controlling the rotation direction of the rotary shaft in consideration of the degree of wear of the movable contactor or the fixed contactor, the degree of wear of the movable contactor or the fixed contactor can be made as uniform as possible, and the use period of the load switch can be increased.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view of a load opening / closing remote control system of a load opening type ground transformer according to an embodiment of the present invention;
FIG. 2 is a view showing a configuration of the ground transformer of FIG. 1,
Figs. 3 and 4 are views showing a configuration of a general load switch,
Figs. 5 and 6 are diagrams showing two examples of the configuration of the motor unit of Fig. 2 and the coupling relationship with the load switch. Fig.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. However, the present invention is not limited to the embodiments described herein but may be embodied in other forms. Rather, the embodiments disclosed herein are provided so that the disclosure can be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

Accordingly, it is to be understood that the invention is capable of numerous changes, has various embodiments, and includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described more fully with reference to the accompanying drawings, in which exemplary embodiments of the invention are shown.

The terms first, second, etc. may be used to describe various components, but the components are not limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may be referred to as a first component.

And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present invention, the terms "comprising" or "having ", and the like, specify that the presence of stated features, integers, steps, operations, elements, But do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries should be construed as meaning consistent with meaning in the context of the relevant art and are to be interpreted as ideal or overly formal in meaning unless explicitly defined in the present invention Do not.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms, and the inventor should appropriately interpret the concepts of the terms appropriately It should be interpreted in accordance with the meaning and concept consistent with the technical idea of the present invention based on the principle that it can be defined.

1 is a diagram showing a schematic configuration of a load opening / closing remote control system of a load opening type ground transforming apparatus according to an embodiment of the present invention, FIG. 2 is a diagram showing the configuration of the grounding transformer of FIG. 1, and FIGS. 3 and 4 FIGS. 5 and 6 are views showing two examples of the configuration of the motor unit and the coupling relationship with the load switch of FIG. 2, respectively.

1 and 2, a load opening / closing remote control system (hereinafter referred to as a "system") of a load opening / closing type ground-based transformer according to an embodiment of the present invention includes a load switch 100, a motor unit 200, a control unit 300, (500) and a central control center (600) including a power transformer (400).

The load switch 100 is mounted on the ground transformer 500 and the movable contact 30 is brought into contact with at least one of the plurality of stationary contacts 40 by rotation of the rotary shaft 20 to open and close the load, Use oil as the oil. Such a load switch 100 may be a load switch for a ground transformer as disclosed in Japanese Patent Application No. 10-0790559.

The control unit 300 is for controlling the motor unit 200. The communication unit 400 is connected to the control unit 300 and may be a wireless or wireless communication unit. The rotation speed and rotation angle information of the motor unit 200 can be transmitted to the central control center 600 through the wired communication network or the control signal of the motor unit 200 can be received from the central control center 600. [

The motor unit 200 includes a motor 201 directly connected to the rotary shaft 20 or a gear 202 connected to and coupled to the rotary shaft 20 to transmit rotational force to the gear 202 And a motor 201 as shown in FIG. When the motor unit 200 is composed of the gear 202 and the motor 201, the tip of the rotating shaft 20 may be mounted with a handle 10 for manual rotation.

Meanwhile, the load switch 100 may be equipped with an insulating oil level sensor connected to the controller 300. At this time, the measured value of the insulating oil level sensor is transmitted to the central control center 600 through the communication unit 400. When the measured value is a threshold value (for example, an insulated flow rate for inserting the insulating oil) The center 600 can be alarmed.

The central control center 600 may monitor the contact position of the movable contactor 30 of the load switch 100 through the motor unit 200 and the control unit 300. The degree of wear of the movable contactor 30 and the fixed contactor 40 can be predicted based on the contact positional state information of the movable contactor 30 and the information on the number of rotations of the rotary shaft 20, The rotational direction of the rotary shaft 20 can be controlled through the motor unit 200 and the control unit 300 in consideration of the degree of wear of the rotary shaft 20.

The system having such a configuration can monitor and remotely control the condition of the load switch 100, thereby shortening the time required for restoring the faulty transformer if an error occurs. In addition, it is possible to monitor the state of the insulating oil remotely, thereby reducing the waste of manpower due to checking of the insulating oil, and preventing an accident caused by insufficient oil. In addition, when configuring the motor unit 200, it is possible to selectively use remote or manual operation, and if the remote control can not be performed due to a failure of the communication unit 400 or the like, manual operation of the load switch 100 is possible . It is also possible to monitor the contact position state of the movable contactor 30 of the load switch 100 through the motor unit 200 and the controller 300 and to monitor the contact position state information of the movable contactor 30, The degree of wear of the movable contactor 30 and the fixed contactor 40 can be predicted based on the information on the number of revolutions of the movable contactor 30 and the fixed contactor 40. [ The degree of wear of the movable contactor 30 or the fixed contactor 40 is adjusted as much as possible by controlling the rotational direction of the rotary shaft 20 in consideration of the degree of wear of the movable contactor 30 or the fixed contactor 40, It is possible to increase the period of use of the battery 100.

Specifically, the central control center 600 is connected to the ground transformer 1 501, the ground transformer 2 502, and the ground transformer N 503 through a communication network as shown in FIG.

The central control center 600 is connected to the movable contactor 30 of the load break switch 100 mounted on the ground transformer through the motor unit 200, the control unit 300, the communication unit 400, The contact position state information and the oil level information of the contact point can be obtained.

3 and 4 are views showing the construction of a general load switch 100 and include a handle 10, a rotary shaft 20, a movable contact 30, and a fixed contact 40. Fig. The load switch 100 is mounted inside the tank 501 of the ground transformer 500 and the handle 10 for rotating the rotary shaft 20 is mounted to be exposed to the outside. The movable contact 30 is a T-type having three blades 31, 32 and 33. The movable contacts 30 are electrically connected to the first to third fixed contacts 41, Abc "in conjunction with the rotation of the rotary shaft 20 to make contact with the two blades 31, 32, 33, or the two blades of the blades 31, 32, 33 contact each other (bc, ac, ab). Where a, b can be high voltage, and c can be a load.

In the switching operation of the movable contactor 30, each of the blades 31, 32, and 33 is rotated in the same direction as the rotating direction of the rotating shaft 20, and a pair of the fixed contacts 41, Is positioned between the plate springs 41a and 41b and continuously comes into contact with the bolt in the axial direction of the bolt by rotation, and the contact is surely provided by the compression of the external compression spring 41c. At this time, the central control center 600 can recognize which blade of the movable contact 30 is in contact with which stationary contactor through the motor unit 200 and the control unit 300, and determine how often and in what order the contact and non- The degree of wear of the blades 31, 32, 33 and the fixed contacts 41, 42, 43 can be predicted to some extent, and the replacement timing can be predicted accordingly. The central control center 600 is connected to each of the ground transformer 1 501, the ground transformer 2 502 and the ground transformer N 503 such that the respective blades 31, 32, 33 and the fixed contacts 41, The degree of wear of the movable contactor 30 or the fixed contactor 40 can be made as uniform as possible by controlling the rotational direction of the rotary shaft 20 in consideration of the degree of use of the respective ground transformers 100, The timing may be adjusted so that the load switch 100 mounted on the ground transformer 100 is replaced at the same time, or the replacement timing may be adjusted differently for each load switch 100 installed in each ground transformer.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It will be understood that various modifications and changes may be made without departing from the scope of the appended claims.

100: Load switch
200:
300:
400:
500: Ground transformer
600: Central Control Center

Claims (5)

The movable contact 30 is mounted on the ground transformer 500 and contacts the movable contactor 30 with at least one of the plurality of stationary contactors 40 by rotation of the rotary shaft 20 so that the load can be opened and closed. A switch (100);
A motor unit 200 for providing a rotational force to the rotary shaft 20;
A control unit 300 for controlling the motor unit 200; And
A communication unit connected to the control unit 300 to transmit the rotation number and rotation angle information of the motor unit 200 to the central control center 600 or to receive the control signal of the motor unit 200 from the central control center 600, (400)
The load switch (100) is equipped with an insulation oil level sensor connected to the controller (300)
The measured value of the insulating oil level sensor is transmitted to the central control center 600 through the communication unit 400,
When the measured value is a threshold value, the central control center 600 broadcasts an alarm,
The central control center 600 monitors the contact position of the movable contactor 30 of the load switch 100 through the motor unit 200 and the controller 300,
The central control center 600 predicts the degree of wear of the movable contactor 30 and the fixed contactor 40 based on the contact position state information of the movable contactor 30 and the rotation number information of the rotation shaft 20, The rotation direction of the rotary shaft 20 is controlled through the motor unit 200 and the control unit 300 in consideration of the abrasion degree of the fixed contact 40 or the fixed contact 40,
The movable contact 30 is a T-type having three blades 31, 32 and 33,
The fixed contact 40 is composed of three fixed contacts 41, 42, 43,
The movable contact 30 rotates in a predetermined direction in association with the rotary shaft 20 to connect at least two of the three blades 31, 32, 33 to the fixed contact 40,
The central control center 600 is connected to the three blades 31, 32 and 33 of the movable contact 30 predicted based on the contact position state information of the movable contact 30 and the rotation number information of the rotation axis 20, 32, 33 of the movable contactor 30 by controlling the rotational direction of the rotating shaft in consideration of the degree of wear of the fixed contacts 41, 42, 43 or the degree of wear of each of the fixed contacts 41, 42, And the degree of wear of each of the fixed contacts (41, 42, 43) is made uniform.
The method according to claim 1,
The motor unit 200 may include a motor 201 directly connected to the rotary shaft 20,
A gear 202 connected to the rotation shaft 20 and linked to the rotation shaft 20, and a motor 201 transmitting rotation force to the gear 202,
Wherein when the motor unit 200 is constituted by the gear 202 and the motor 201, the handle 10 for manual rotation is mounted on the tip of the rotating shaft 20, Control system.
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